Can opener



FIG. 1 is a front elevational view of a can opener showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a front perspective view thereof. 

The ornamental design for a can opener, as shown and described. 